Warp stop-motion.



PATENTED APR. 17, 1906.

N. FOERSTBR. WARP STOP MOTION.

APPLIOATION FILED AUG. 18, 1905.

2 SHEBTSSHEBT l FIG. 2.

; INVENTOR:

WITNESSES: 4m;

PATENTED APR. 17, 1906.

N. FOERSTER.

WARP STOP MOTION.

APPLICATION FILED AUG.18, 1905.

Z SHEETSSHEET 2.

INVENTOR:

WITNESSES:

NORBERT FOERSTER, OF PASSAIC, NEW JERSEY.

WARP STOP-MOTION.

Specification of Letters Patent.

Patented April 17, 1906.

Application filed August 18, 1905. Serial No. 274,655.

To all whom it may concern;

Be it known that I, NORBERT FoERsTER, a citizen of the United States, residing at Passaic, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Warp Stop-Motions, of which the following is a specification.

In my application for patent, Serial No. 272,968, filed August 4,1905,I have described in detail a warp stop-motion in which actuating devices are supported upon the warpthreads and upon breakage of the latter drop to a position to complete an electric circuit, and thus throw the starting-lever to the position where it stops the operation of the loom. The present application covers a warp stopmotion which is similar in its general operation and varies particularly in the arrangement and construction of the actuating devices.

The accompanying drawings illustrate an embodiment of the invention.

Figure 1 is a vertical section parallel to the warp-threads. Fig. 2 is a plan of a portion of the same part of the machine. Fig. 3 is a side elevation of the rear of the loom. Fig. 4 is a plan of Fig. 3, omitting certain parts for clearness.

The actuating devices in the present case are pivoted below the warp-threads, where they are less in the way of the lever and where, when a thread breaks and the drop falls, its leverage becomes greater than when it is supported upon the thread. Other advantages referred to hereinafter flow from the arrangement described.

Referring to the embodiment illustrated, the actuating devices are the levers A, pivoted upon the rod B, running across the ma chine a suitable distance below the warpthreads and constituting one terminal of an electric circuit, as indicated by the wire 0, running therefrom. The opposite terminal of the circuit is a rod D, parallel with the rod B and a short distance in the rear thereof, the circuit-wire being indicated at E. The upper and preferably longer end F of the lever A rests upon the crossed warp-threads G and H and is supported thereby, and thus holds the lower shorter end J away from the terminal rod D.

No part of the mechanism projects above the warphreads except the short exposed portion of the end F of the lever, and therefore the threads are all freely accessible to the weaver and the actuating devices do not inupon arms 0, fixed upon terfere with his work of repairing the threads. By arranging the contacts B and D close together, the weight of the long arm F presses the short arm J against the contact-rod D with a considerable pressure. By reason of the arranging of the pivot B below the warpthreads the ileverage, and consequently the pressure and degree of contact, becomes greater if a thread is broken and the lever has fallen to a more nearly horizontal position. Therefore the lever may be arranged originally in a position so nearly vertical as to exert only the slightest pressure upon the warpthreads, a point of the highest importance. The arrangement shown also permits the levers A to be thrown back, (as shown at A,) so that they rest against the rear rod K when a thread is broken and is being repaired.

By reason of the center of gravity of each lever being above its pivotal point it is advisable to provide a guide to prevent its falling sidewise. For this purpose I provide in the rear of the levers a sort of comb L, the teeth M of which are so spaced as to engage between them one or more levers A. For example, in the comb shown two levers A are engaged between adjacent teeth M of the comb. I propose to provide also, as in the above-referred-to application, a means for throwing the actuating devices out of operative position and holding them so until the loom has made a few turns. For example, a rod N normally stands in the full-line position shown in Fig. 1. When a thread breaks, the rod is thrown to the dotted-line position, lifting the lever, so that it no longer bears upon the thread when the latter is repaired. After the loom has made a few turns, so as to take up the slack thread, the rod N is restored to the full-line position and the actuating devices assume their operative position. For obtaining the desired movements the rod N is mounted a pivotal rod P, which carries a weight Q, tending to throw the rod N always to its inoperative position, the rod P having also an arm R, limiting its turning movement by bearing against the cam-shaft S. When by means of a handlever T the rod N is swung to its operative position, the end of the arm R is lifted and the spring U shifts the rod P and arm R until the latter rests upon the screw-threaded collar V on the cam-shaft. This collar being larger than the cam-shaft holds the arm up and holds the rod N in its operative position.

in front of the levers The end of the, arm R, however, is engaged by the screw-thread, and when the loom is again started the screw-thread forces the arm, and with it the pivotal rod P, arms 0, and rod N back against the spring U. At the end of the screw-thread the arm R escapes, and by its weight and the additional weight Q the rod N is swung back to its normal inoperative position.

An important feature of the invention is the arranging of the actuating device so that its operative pressure increases after the thread breaks, the simplest form of such a construction being represented by the levers A, which are pivoted below the normal positions of their centers of gravity, so that when supported upon the thread they eXert very little pressure but when the thread breaks their centers ,of gravity swing outward and exert a greater pressure.

Though I have described with great particularity of detail a specific embodiment of this invention, yet it is not to be understood therefrom that the invention is limited to the particular embodiment disclosed.

Various modifications thereof in detail and in the arrangement and combination of the parts may be made by those skilled in the art without departure from the invention.

What I claim is A warp stop-motion for looms including a pivot-rod B below the Warp and forming one terminal of an electric circuit, a rod D below the warp and forming the opposite terminal, a series of levers A pivoted loosely on the rod B and having a longer arm projecting upward at an angle and resting upon a crossingpoint of two warp-threads and adapted to swing down by its weight when a thread breaks, each of said levers A having also a shorter arm J adapted to swing against said rod D and to be pressed there by the weight of the longer arm when the latter swings down, a comb L having teeth embracing the longer arms of said levers to prevent lateral displacement thereof, said rod D and comb L being mounted in the rear (f said levers A, and a rod N in front of said levers adapted to be moved against the same to hold them in their inoperative positions regardless of the condition of the threads.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

NORBERT FOERSTER. Witnesses:

DOMINGO A. USINA,

THEODORE T. SNELL. 

